UCC281 [TI]
具有 -40°C 至 +85°C 工作温度范围和反向电流保护功能的 1A、低压降稳压器;![UCC281](http://pdffile.icpdf.com/pdf1/p00188/img/icpdf/UCC281_1065444_icpdf.jpg)
型号: | UCC281 |
厂家: | ![]() |
描述: | 具有 -40°C 至 +85°C 工作温度范围和反向电流保护功能的 1A、低压降稳压器 电源电路 线性稳压器IC |
文件: | 总10页 (文件大小:101K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
Low Dropout 1 Ampere Linear Regulator Family
DESCRIPTION
FEATURES
The UCC381-3/-5/-ADJ family of positive linear series pass regulators is
tailored for low drop out applications where low quiescent power is impor-
tant. Fabricated with a BiCMOS technology ideally suited for low input to
output differential applications, the UCC381 will pass 1A while requiring
only 0.5V of input voltage headroom. Dropout voltage decreases linearly
with output current, so that dropout at 200mA is less than 100mV. Quies-
cent current is always less than 650µA. To prevent reverse current conduc-
tion, on-chip circuitry limits the minimum forward voltage to typically 50mV.
Once the forward voltage limit is reached, the input-output differential volt-
age is maintained as the input voltage drops until undervoltage lockout dis-
ables the regulator.
• Precision Positive Linear Voltage
Regulation
• 0.5V Dropout at 1A
• Guaranteed Reverse Input/ Output
Voltage Isolation with Low Leakage
• Low Quiescent Current Irrespective of
Load
• Adjustable Output Voltage Version
• Fixed Versions for 3.3V and 5V
Outputs
UCC381-3 and UCC381-5 versions have on-chip resistor networks preset
to regulate either 3.3V or 5.0V, respectively. Furthermore, remote sensing
of the load voltage is possible by connecting the VOUTS pin directly at the
load. The output voltage is then regulated to 1.5% at room temperature and
better than 2.5% over temperature. The UCC381-ADJ version has a regu-
lated output voltage programmed by an external user-definable resistor ra-
tio.
• Logic Shutdown Capability
• Short Circuit Power Limit of
3% • V • Current Limit
IN
• Remote Load Voltage for Accurate
Load Regulation
(continued)
BLOCK DIAGRAM
VIN
8
1
4
VOUT
V
PUMP
VOUTS
VOLTAGE
AMPLIFIER
CURRENT
LIMIT
R2
R1
–
+
–
+
1.3/2.1A
CURRENT
REFERENCE
2
3
6
7
GND
GND
GND
GND
1.25V
SHUTDOWN FOR FIXED VERSIONS
CT*
5
0.65V
3% DUTY CYCLE
CURRENT LIMIT TIMER
*ADJ
VERSION
ONLY
R2
0
R1
OPEN
50k
REVERSE VOLTAGE
SENSE
UCC381-ADJ
UCC381-3
UCC381-5
UVLO
82k
150k
THERMAL
SHUTDOWN
50k
UDG-98112
SLUS214B -JANUARY 2001
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
CONNECTION DIAGRAMS
ABSOLUTE MAXIMUM RATINGS
VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V
CT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 to 3V
Storage Temperature . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . −55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
SOIC-8 (Top View)
DP Package
VOUT
GND
8
7
6
5
VIN
1
2
3
4
GND
GND
CT*
Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages. All voltages are referenced to
GND.
GND
VOUTS
* ADJ version only
DESCRIPTION (cont.)
Short circuit current is internally limited. The device re-
sponds to a sustained overcurrent condition by turning
The UCC381 can be shutdown to 25µA (max) by pulling
the CT pin low.
off after a T
delay. The device then stays off for a pe-
ON
Internal power dissipation is further controlled with ther-
mal overload protection circuitry. Thermal shutdown oc-
curs if the junction temperature exceeds 165°C. The chip
will remain off until the temperature has dropped 20°C.
riod, T
, that is 32 times the T
delay. The device
ON
OFF
then begins pulsing on and off at the T
duty cycle of 3%. This drastically reduces the power dis-
sipation during short circuit such that heat sinking, if at all
/(T +T
)
ON
ON OFF
required, must only accommodate normal operation. On The UCC281 series is specified for operation over the in-
the fixed output versions of the device TON is fixed at
400µs − a guaranteed minimum. On the adjustable ver-
sion an external capacitor sets the on time. The off time
dustrial range of −40°C to +85°C, and the UCC381 se-
ries is specified from 0°C to +70°C. These devices are
available in the 8 pin DP surface mount power package.
For other packaging options consult the factory.
is always 32 times T
.
ON
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = 0°C to 70°C for the
UCC381-X series and −40°C to +85°C for the UCC283-X series, VIN = VOUT + 1.5V, IOUT = 0mA, COUT = 2.2µF. CT = 1500pF for
the UCC381-ADJ version and VOUT set to 5V. TJ = TA.
PARAMETER
UCC381-5 Fixed 5V, 1A Family
Output Voltage
TEST CONDITIONS
MIN
TYP
MAX UNITS
TJ = 25°C
4.925
4.875
5
5.075
5.125
3
V
V
Over Temperature
Line Regulation
VIN = 5.15V to 9V
1
2
mV
mV
V
Load Regulation
IOUT = 0mA to 1A
5
Drop Out Voltage, VIN – VOUT
IOUT = 1A, VOUT = 4.85V, TA < 85°C
IOUT = 200mA, VOUT = 4.85V, TA < 85°C
VOUT = 0V
0.5
100
2
0.6
200
3.5
1.8
5
mV
A
Peak Current Limit
Overcurrent Threshold
Current Limit Duty Cycle
Overcurrent Time Out, TON
Quiescent Current
1
A
VOUT = 0V
VOUT = 0V
3
%
400
750
400
10
1600
650
25
µs
µA
µA
V
Quiescent Current in Shutdown
Shutdown Threshold
VIN = 9V
At CT Input
0.25
2.5
0.65
Reverse Leakage Current
UVLO Threshold
1V < VIN < VOUT, VOUT < 5.1V, at VOUT
VIN where VOUT passes current
75
µA
V
2.8
3.0
2
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = 0°C to 70°C for the
UCC381-X series and −40°C to +85°C for the UCC283-X series, VIN = VOUT + 1.5V, IOUT = 0mA, COUT = 2.2µF. CT = 1500pF for
the UCC381-ADJ version and VOUT set to 5V. TJ = TA.
PARAMETER
UCC381-3 Fixed 3.3V, 1A Family
Output Voltage
TEST CONDITIONS
MIN
TYP
MAX UNITS
TJ = 25°C
3.25
3.22
3.3
3.35
3.38
3
V
V
Over Temperature
Line Regulation
VIN = 3.45V to 9V
1
2
mV
mV
V
Load Regulation
IOUT = 0mA to 1A
5
Dropout Voltage, VIN - VOUT
IOUT = 1A, VOUT = 3.15V, TA < 85°C
IOUT = 200mA, VOUT = 3.15V, TA < 85°C
VOUT = 0V
0.6
100
2
0.8
200
3.5
1.8
5
mV
A
Peak Current Limit
Overcurrent Threshold
1
A
Current Limit Duty Cycle
Overcurrent Time Out, TON
Quiescent Current
VOUT = 0V
VOUT = 0V
3
%
400
750
400
10
1600
650
25
µs
µA
µA
V
Quiescent Current in Shutdown
Shutdown Threshold
VIN = 9V
At CT Input
0.25
2.5
0.65
Reverse Leakage Current
UVLO Threshold
1V < VIN < VOUT, VOUT < 3.35V, at VOUT
VIN where VOUT passes current
75
µA
V
2.8
3.0
UCC381-ADJ Adjustable Output, 1A Family
Regulating Voltage at ADJ Input
TJ = 25°C
1.23
1.22
1.25
1.27
1.28
3
V
V
Over Temperature
VIN = VOUT + 150mV to 9V
IOUT = 0mA to 1A
Line Regulation, at ADJ Input
Load Regulation, at ADJ Input
Dropout Voltage, VIN - VOUT
1
2
mV
mV
V
5
IOUT = 1A, VOUT = 4.85V
IOUT = 200mA, VOUT = 4.85V
VOUT = 0V
0.5
100
2
0.6
200
3.5
1.8
5
mV
A
Peak Current Limit
Overcurrent Threshold
Current Limit Duty Cycle
Overcurrent Time Out, TON
Quiescent Current
1
A
VOUT = 0V
3
%
VOUT = 0V, CT = 1500pF
400
1000 1600
µs
µA
µA
V
400
10
650
25
Quiescent Current in Shutdown
Shutdown Threshold
VIN = 9V
At CT Input
0.25
2.5
0.65
Reverse Leakage Current
Bias Current at ADJ Input
UVLO Threshold
1V < VIN < VOUT, VOUT < 9V, at VOUT
100
250
3.0
µA
nA
V
100
2.8
VIN where VOUT passes current
3
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
PIN DESCRIPTIONS
spect to the required transient loading. For example, if
the load is very dynamic, a large capacitor will smooth
out the response to load steps.
CT: For UCC381-3 and UCC381-5 versions, this is the
shutdown pin which, when pulled low, turns off the regu-
lator output and puts the device in a low current state.
For the UCC381-ADJ version, a capacitor is required be-
VOUTS: Feedback for regulator sensing of the output
voltage. For loads which are a considerable resistive dis-
tance from the VOUT pin, the VOUTS pin can be used to
move the resistance into the control loop of the regulator,
thereby effectively canceling the IR drop associated with
the load path. For local regulation, merely connect this
pin directly to the VOUT pin. For the UCC381-ADJ ver-
sion, the output voltage can be set by two external resi-
tors according to the following relationship:
tween the CT pin and GND to set the T
overcurrent according to the following (typical) equation:
time during
ON
TON = 660,000 • CCT
GND: All voltages are measured with respect to this pin.
This is the low noise ground reference input for regula-
tion. The output decoupling capacitor should be tied to
PIN 7.
VIN: Positive supply input for the regulator. Bypass this
pin to GND with at least 1µF of low ESR, ESL capaci-
tance if the source is located further than 1 inch from the
device.
R2
VOUT =1.25• 1+
R1
VOUT: Output for regulator. The regulator does not re- where R1 is a resistor connected between VOUT and
quire a minimum output capacitor for stability. Choose VOUTS and R2 is a resistor connected between VOUTS
the appropriate size capacitor for the application with re- and GND.
TYPICAL APPLICATION CIRCUIT
CT
NOTE 2
SHUTDOWN
R2
NOTE 1
5
CT
4
1
VOUTS
VOUT
VIN
R1
NOTE 1
UCC381
8
VIN
OUTPUT
1.0µF
GND GND GND GND
COUT
7
6
3
2
UDG-98148
Note 1: R1 and R2 for adjustable version only. For 3.3V and 5V versions connect VOUT to VOUTS. See Pin Descriptions.
Note 2: CT timing capacitor is for adjustable version only. For 3.3V and 5V versions, the CT pin is used to enable or shutdown
the part. See Pin Descriptions.
4
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
APPLICATION INFORMATION
Overview
A capacitive load on the regulator’s output will appear as a
short circuit during start-up. If the capacitance is too large,
the output voltage will not come into regulation during the
The UCC381 family of low dropout linear (LDO) regula-
tors provide a regulated output voltage for applications
with up to 1A of load current. The regulator features a
low dropout voltage and short circuit protection, making
their use ideal for demanding high current applications
requiring fault tolerance.
initial T
period and the UCC381 will enter pulsed mode
ON
operation. The peak current limit, T
period, and load
ON
characteristics determine the maximum value of output ca-
pacitor that can be charged. For a constant current load
the maximum output capacitance is given as follows:
Short Circuit Protection
TON
(1)
COUT max = I −ILOAD
•
Farads
(
)
CL
(
)
The UCC381 provides unique short circuit protection
circuitry that reduces power dissipation during a fault.
When an overload situation is detected, the device en-
ters a pulsed mode of operation at 3% duty cycle re-
ducing the heat sink requirements during a fault. The
UCC381 has two current thresholds that determine its
behavior during a fault as shown in Fig. 1.
VOUT
For worst case calculations the minimum values of on time
(T ) and peak current limit (I ) should be used. The ad-
ON
CL
justable version allows the T
time to be adjusted with a
ON
capacitor on the CT pin:
TON adj µsec = 660,000 • C µFarads
(2)
(
)
(
)
(
)
When the regulator current exceeds the Overcurrent
For a resistive load (R
) the maximum output capacitor
LOAD
Threshold for a period longer than the T , the
ON
can be estimated from:
UCC381 shuts off for a period (T
) which is 32 times
OFF
T
. If the short circuit current exceeds the Peak Cur-
ON
COUT max
=
)
(3)
(
rent Limit, the regulator limits the current to peak cur-
rent limit during the T period. The peak current limit
TON
ON
Farads
is nominally 1 Amp greater than the overcurrent thresh-
old. The regulator will continue in pulsed mode until the
fault is cleared as illustrated in Fig. 1.
1
RLOAD • ln
VOUT
1−
ICL • RLOAD
OVERLOAD
OUTPUT
CURRENT
PEAK CURRENT
LIMIT
I
O (nom)
OVERCURRENT
THRESHOLD
VO
(nom)
ROL ICL
OUTPUT
VOLTAGE
TON
TON
TON
32TON
32TON
32TON
UDG-98150
Figure 1. UCC381 short circuit timing.
5
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
APPLICATION INFORMATION (cont.)
Dropout Performance
Vout = 3V
Vout = 3.3V
Vout = 5V
Referring to the Block Diagram, the dropout voltage of
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
the UCC381 is equal to the minimum voltage drop (V to
IN
V
) across the N-Channel MOSFET. The dropout volt-
OUT
age is dependent on operating conditions such as load
current, input and load voltages, as well as temperature.
The UCC381 achieves a low Rds
through the use of
(ON)
an internal charge-pump (V
) that drives the MOS-
PUMP
FET gate. Fig. 2 depicts typical dropout voltages versus
load current for the 3.3V and 5V versions of the part, as
well as the adjustable version programmed to 3.0V.
Fig. 3 depicts the typical dropout performance of the ad-
justable version with various output voltages and load
currents.
0.2
0.4
0.6
IOUT(A)
0.8
1
Operating temperatures effect the RDS(ON) and dropout
voltage of the UCC381. Fig. 4 graphs the typical dropout
for the 3.3V and 5V versions with a 3A load over tem-
perature.
Figure 2. Typical dropout vs. load current.
DROP (3V)
DROP (5V)
Voltage Programming
0.8
0.7
0.6
0.5
0.4
Referring to the Typical Application Circuit, the output
voltage for the adjustable version is externally pro-
grammed through a resistive divider at the VOUTS pin as
shown.
R2
R1
(4)
VOUT =1.25• 1+
Volts
For the fixed Voltage versions the resistive divider is in-
ternally set, and the VOUTS pin should be connected to
the VOUT pin. The maximum programmed output volt-
age for the adjustable part is constrained by the 9V ab-
solute rating of the IC (including the charge pump
voltage) and its ability to enhance the N-Channel MOS-
FET. Unless the load current is well below the 1A rating
of the device, output voltages above 7V are not recom-
mended. The minimum output voltage can be pro-
grammed down to 1.25V, however, the input voltage
must always be greater than the UVLO of the part.
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
Figure 4. Typical dropout vs. temperature (1A load).
Iout = 0.2A
Iout = 0.5A
Iout = 1.0A
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Shutdown Feature
All versions include a shutdown feature, limiting quies-
cent current to 25µA typical. The UCC381 is shut down
by pulling the CT pin to below 0.25V. As shown in the
applications circuit, a small logic level MOSFET or BJT
transistor connected to the CT pin can be driven with a
digital signal, putting the device in shutdown. If the CT
pin is not pulled low, the IC will internally pull up on the
pin, enabling the regulator. The CT pin should not be
forced high, as this will interfere with the short circuit pro-
tection feature. Selection of the timing capacitor for the
adjustable version is explained in the Short Circuit Pro-
tection section.
3
3.5
4
4.5
5
VOUT (V)
Figure 3. Typical dropout voltate vs. I
and V
OUT.
OUT
6
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
APPLICATION INFORMATION (cont.)
Thermal Design
mal resistance is required by the application, the device
heat sinking would need to be improved.
The Packing Information section of the data book con-
tains reference material for the thermal ratings of various
packages. The section also includes an excellent article
Thermal Characteristics of Surface Mount Packages, that
is the basis of the following discussion.
When the UCC381 regulator is in pulsed mode, due to
an overload or short circuit in the application, the maxi-
mum average power dissipation is calculated as follows:
PPULSE avg
=
)
(6)
(
Thermal design for the UCC381 includes two modes of
operation, normal and pulsed mode. In normal operation,
the linear regulator and heat sink must dissipate power
equal to the maximum forward voltage drop multiplied by
the maximum load current. Assuming a constant current
load, the expected heat rise at the regulator’s junction
can be calculated as follows:
TON
V
(
−VOUT • I
•
CL
Watts
)
IN
33 • TON
As seen in equation 6, the average power during a fault
is reduced dramatically by the duty cycle, allowing the
heat sink to be sized for normal operation. Although the
peak power in the regulator during the T period can be
significant, the thermal mass of the package will gener-
ally keep the junction temperature from rising unless the
ON
TRISE =PDISS • θ jc + θca °C
(5)
(
)
Where theta is thermal resistance and P
is the power
DISS
T
period is increased to tens of milliseconds.
ON
dissipated. The thermal resistance of both the SOIC-8
DP package (junction to case) is 22 degrees Celsius per
Watt. In order to prevent the regulator from going into
thermal shutdown, the case to ambient theta must keep
the junction temperature below 150C. If the LDO is
mounted on a 5 square inch pad of 1 ounce copper, for
example, the thermal resistance from junction to ambient
becomes 40-70 degrees Celsius per Watt. If a lower ther-
Ripple Rejection
Even though the UCC381 linear regulators are not opti-
mized for fast transient applications (Refer to UC182
“Fast LDO Linear Regulator”), they do offer significant
power supply rejection at lower frequencies. Fig 5. de-
picts ripple rejection performance in a typical application.
The performance can be improved with additional filter-
ing.
90
80
70
60
50
40
30
20
10
0
10uF,
IOUT = 100mA
1uF, IOUT = 100mA
10uF, IOUT = 1A
1uF, IOUT = 1A
1.0E+02
1.0E+03
1.0E+04
1.0E+05
FREQUENCY
Figure 5. Ripple rejection vs. frequency.
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
7
PACKAGE OPTION ADDENDUM
www.ti.com
4-Nov-2005
PACKAGING INFORMATION
Orderable Device
UCC281DP-5
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Package Package
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
Qty
Type
Drawing
SOIC
D
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
75 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
UCC281DP-ADJ
UCC281DPTR-5
UCC281DPTR-5G4
UCC281DPTR-ADJ
UCC281DPTR-ADJG4
UCC381DP-3
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
D
D
D
D
D
D
D
D
D
D
D
D
D
D
75 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
75 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
UCC381DP-5
75 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
UCC381DP-ADJ
UCC381DP-ADJG4
UCC381DPTR-3
UCC381DPTR-3G4
UCC381DPTR-5
UCC381DPTR-ADJ
UCC381DPTR-ADJG4
75 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
75 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR
no Sb/Br)
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan
-
The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS
&
no Sb/Br)
-
please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
4-Nov-2005
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
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Addendum-Page 2
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